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diff --git a/testing/web-platform/tests/intersection-observer/observer-callback-arguments.html b/testing/web-platform/tests/intersection-observer/observer-callback-arguments.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>IntersectionObserver: callback arguments</title>
+<link rel="help" href="https://w3c.github.io/IntersectionObserver/#notify-intersection-observers-algo">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+"use strict";
+
+async_test(t => {
+ const io = new IntersectionObserver(function(entries, observer) {
+ t.step(() => {
+ assert_equals(this, io);
+ assert_equals(arguments.length, 2);
+ assert_true(Array.isArray(entries));
+ assert_equals(entries.length, 1);
+ assert_true(entries[0] instanceof IntersectionObserverEntry);
+ assert_equals(observer, io);
+
+ io.disconnect();
+ t.done();
+ });
+ });
+
+ io.observe(document.body);
+}, "Callback is invoked with |this| value of IntersectionObserver and two arguments");
+</script>